Kurzweil K250 - Page 113

Using an oscilloscope with probe, check for the following
square waves a~ the Ie and pin number il"!dicated:
IC NUMBER
U68
U68
U68
U69
U69
U69
IC NUMBER
U87
U87
U87
U88
U88
U88
U106
U106
U106
U107
U107
U107
U118
U118
U118
U119
U119
U119
PIN NUMBER
SGlUARE WAVE PERIOD
10·
200
nsec.
13
400
nsec.
17
600
nsec.
10
800
nsec.
13
1
J...lsec.
17
2
J...lsec.
PIN NUMBER
SQUARE WAVE PERIOD
10
3
J...lsec.
13
4
J...lsec.
17
5
J...lsec.
10
6
J...lsec.
13
7
J...lsec.
17
8
J...lsec.
10
9
J...lsec.
13
25
J...lsec.
17
50
J...lsec.
10
75
J...lsec.
13
100
J...lsec.
17
125
J...lsec.
10
150
J...lsec.
13
175
J...lsec.
17
200
J...lsec.
10
225
J...lsec.
13
250
J...lsec.
17
500
J...lsec.
Kurzweil 250 Service Manual, Chapter 4
4-43